共查询到19条相似文献,搜索用时 140 毫秒
1.
四川自贡大山铺成渝龟科一新属 总被引:1,自引:1,他引:0
描述了产自四川自贡大山铺恐龙化石坑中的三件龟甲标本,命名为一新属新种-周氏四川龟(Sichuanchelycowigen.et.sp.nov.)。该属以椎盾极横宽,中部缘盾极狭长为主要特征,它代表了成渝龟科中一类较特别的类型。 相似文献
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描述了产自四川自贡大山铺恐龙化石坑中的三件龟甲标本,命名为一新属新种—周氏四川龟(Sichuanchelyschowigen.etsp.nov.)。该属以椎盾极横宽,中部缘盾极狭长为主要特征,它代表了成渝龟科中一类较特别的类型。 相似文献
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中国小毛瓢虫二新种记述(鞘翅目:瓢虫科) 总被引:1,自引:0,他引:1
中国小毛瓢虫二新种记述(鞘翅目:瓢虫科)任顺祥,庞雄飞(华南农业大学昆虫生态室广州510642)本文描述采自贵州和四川的小毛瓢虫属ScymnusKugelann小毛瓢虫亚属Scymnus(Scymnus)Kugelann二新种。模式标本保存于华南农业... 相似文献
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我国新担子菌类补遗 总被引:1,自引:1,他引:0
在研究甘肃、四川、云南的担子菌类时发现如下4新种:云南地红菇(MacowanitesyunnanensisZang),属红菇科(Rusulaceae),地红菇属(MacowanitesKalchbr.)系我国新记录;松针锈耳(CrepidotuspinicolaZang)绣耳科(Crepidotaceae);蛇盖条孢牛肝菌(BoletelusserpentipileusZangetYuan),属松塔牛肝菌[疣孢牛肝菌科](Strobilomycotaceae);喜杉绒盖牛肝菌(XerocomuspiceicolaZangetYuan),属牛肝菌科(Boletaceae);长柄灰包(LycoperdonlongistipumZangetYuan),属灰包科(Lycoperdaceae)。 相似文献
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雅鲁藏布江大拐弯地区蕨类植物科属区系特征分析 总被引:4,自引:0,他引:4
雅鲁藏布江大拐弯地区蕨类植物区系共含45科、108属。主要科为鳞毛蕨科Dryopteridaceae(80/5,种数/属数)、水龙骨科Polypodiaceae(65/14)、蹄盖蕨科Athyriaceae(45/11)、铁角蕨科Aspleniaceae(23/3)、中国蕨科Sinopteridaceae(19/6)、金星蕨科Thelypteridaceae(18/9)、凤尾蕨科Pteridaceae(13/2)、卷柏科Selaginelaceae(12/1)和膜蕨科Hymenophylaceae(11/3)。主要属是耳蕨属Polystichum,鳞毛蕨属Dryopteris,铁角蕨属Asplenium,蹄盖蕨属Athyrium等系统发育上较高级的类群;无典型的特有属,可认为它是随青藏高原隆起而形成的较年轻的蕨类区系。其热带成分科属虽多(科占622%,属占676%),但优势科、优势属均为广布类型。本区蕨类植物的起源是古老的热带亚洲成分。 相似文献
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山东宁阳早更新世哺乳动物化石(英文) 总被引:2,自引:2,他引:0
1999年,作者收到王元青博士转来胡长康老师未研究的一批哺乳动物化石。这些化石由山东省博物馆工作人员采自山东宁阳县伏山的裂隙堆积物中。根据化石围岩判断这批化石可归入同一动物群。该动物群包含12种:松鼠科1种(Sciurotamias sp.),兔科2种(Brevilagus brachypus,Lepus sp.),食肉目5种(Pachycrocuta perrieri,Nyctereutes sinensis,Canis variabilis, Homotherium sp.和Meles sp.),牛科2种(Gazella sp., Ovibovinae gen etsp.indet.),鹿科2种(Cervus sp.,Cervidae gen et sp.indet.)。其中,Pachycrocuta perrieri个体明显小于桑氏鬣狗(Pachycrocuta licenti),p2后附尖较发育,p4前附尖高,ml三角座窄。四川巫山原鉴定为桑氏鬣狗的标本中至少有一件下颌骨(重庆自然博物馆,CV877)应当归入此种。Meles sp.具有较周口店第18点发现的Meles chiai及中更新世常见的Meles mel? 相似文献
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北票尖山沟义县组下部两种膜翅目昆虫化石 总被引:3,自引:0,他引:3
描述了产自辽这西部北票上园地区尖山沟上侏罗统义县组上部膜翅目昆虫化石1新属2新种。新属新种Procretuania Pristina gen.et sp.nov.归人白垩旗腹姬蜂科(Cretevaniidae),新种Gurvanotrupes liaoningensis sp.nov。归入细蜂科(Serphidae).这是Cretevaniidae科和Gurvanotrupes属在我国的首次发现 相似文献
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金粟兰科的起源,演化及其分布 总被引:9,自引:3,他引:6
本文利用形态解剖,孢粉学及化石资料,讨论了金粟兰科的系统;并对其起源,演化和现代分布格局形成等问题做了合理推测,主要结果如下:(1)Sarcandra和Chloranthus的亲缘关系最接近,而Ascarina和Hedyosmum的系统位置最靠近。Sarcandra是金粟兰科中最原始的属,而Hedyosmum则是最进化的属。(2)金粟兰科可能于白垩纪最早期起源于木质部无导管的,具简单两性虫媒花的祖 相似文献
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四川华绿螽属一新种记述(直翅目:螽斯科,露螽亚科)石福明,郑哲民(山西师范大学生物系临汾041004)(陕西师范大学动物研究所西安710062)本文报道华绿螽属一新种,细沟华绿螽Sinochloragracilisulculasp.nov,模式标本保... 相似文献
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研究了中国金小蜂科、金小蜂亚科的瘿蚊金小蜂属Propicroscytus Szelenyi,1941,重新描述了中国分布的2个种:斑腹瘿蚊金小蜂Propicroscytus mirificus(Girault)及斑腹金小蜂Propicroscytus oryzae (Subba Rao),编制了中国瘿蚊金小峰属分种检索表。其中,斑腹瘿蚊金小蜂Propicroscytus mirificus (Gi 相似文献
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《Geobios》2016,49(5):355-364
A juvenile turtle from the upper Kimmeridgian (Upper Jurassic) of Nusplingen is identified as an eurysternid turtle. It differs in plastral morphology from a juvenile eurysternid turtle from the latest Kimmerdigian of Kelheim described in the 19th century, which represents a comparably early developmental stage. Both juveniles have primordial ribs not yet transformed into costals and lack all other carapacial elements whereas the plastral elements are well developed. The new specimen from Nusplingen has a more robust plastron type when compared to the very gracile, bow- or arc-shaped plastron type of the formerly described juvenile. Both plastron types are also represented by yet undescribed additional juvenile, medium-sized and/or larger eurysternid specimens. The juvenile specimens thus likely document the presence of two morphologically very similar eurysternid taxa in the Upper Jurassic of southern Germany. Both plastron types are different from those described for Idiochelys and Solnhofia but may resemble plastron morphology of Eurysternum, which is, however, only incompletely known. 相似文献
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新疆首次发现的侏罗纪龟类 总被引:2,自引:2,他引:0
本文记述了新疆准噶尔盆地的一件龟化石,名为准噶尔新疆龟,新属、新种 (Xinjiangchelys junggarensis, Gen. et sp. nov.),其时代可能为中侏罗世.这是新疆地区侏罗纪龟类的首次记录.早、中侏罗世是龟类的早期进化阶段,国外材料甚少.文章在讨论了新疆龟的系统分类后,综述了我国早、中侏罗世的龟类记录,并结合泰国近年发现的晚三叠世的龟类,认为亚洲是迄今所知拥有龟鳖类进化各时期记录最完全的地区,是探索龟类起源和早期进化的重要地区之一. 相似文献
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四川自贡大山铺的龟化石 总被引:1,自引:1,他引:0
四川自贡大山铺富产中侏罗世的龟类。这批化石,除个别几件已有记述外,其余更多保存在自贡恐龙博物馆的标本均未报道。本文除对它们进行系统记述外,并综观我国迄今已知中侏罗世的龟类,建立一新科,成渝龟科(Chengyuchclyidae fam.nov.),解决了我国这一时期龟类长期未定的归科问题。 相似文献
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G. O. Cherepanov 《Paleontological Journal》2016,50(14):1641-1648
The turtle shell is characterized by a high degree of conservatism of the fundamental model and, at the same time, a high variability at the individual level. The components of the bony shell vary in origin. The costal and neural plates of the carapace are modified elements of the axial skeleton (ribs and neural arches) and the plastral plates are transformed dermal ossifications of the shoulder girdle and gastralia, peripheral, pygal, and suprapygal plates are similar to osteoderms of other reptiles. The variability of the structure of particular parts of the turtle shell is manifested differently. Most anomalies have been recorded in the caudal part of the carapace. The plastron is relatively stable in morphology. Variations in the bony shell structure are observed in (1) unusual shape and size of plates combined with normal number of plates, (2) presence of additional plates, and (3) absence of regular plates. Based on the morphogenetic characteris-tics, anomalies are subdivided into (1) variations caused by changes in the number of elements of the axial skeleton or their contacts with the dermis (neurals and costals); (2) variations due to changes in the number of horny scutes (peripherals); (3) variations connected with irregular osteogeny or disturbed growth of bones 相似文献
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Abstract: The Spanish town of Galve (Teruel) is notable because of the abundance of Upper Jurassic and, especially, Lower Cretaceous vertebrates recorded there. Although most groups have been studied in detail, information on turtles is very limited even though the material is relatively abundant. So far, no turtle taxa have been identified at the generic level. The only Lower Cretaceous articulated specimen from Galve is analysed here. It is identified as a representative of Cryptodira, Galvechelone lopezmartinezae gen. et sp. nov. Galvechelone lopezmartinezae is determined as a taxon belonging to the node that groups the turtles traditionally assigned to ‘Macrobaenidae’ and ‘Sinemydidae’, and other taxa such as the members of Panchelonioidea. This node, very abundant in the Lower Cretaceous of Asia, and with a broad subsequent distribution, has recently been recognized in the Lower Cretaceous of Europe. The diversity of basal members of Eucryptodira in the European Late Jurassic (represented by Thalassemydidae, Plesiochelyidae and Eurysternidae) was high. Owing to a relative scarcity of well‐preserved early Cretaceous turtles from Europe, the knowledge of this group of reptiles is limited. The study of the new turtle from Galve, together with the recently described Hoyasemys jimenezi, and the recently completed review of the enigmatic Chitracephalus dumonii demonstrate that members of the cryptodiran node grouping ‘Macrobaenidae’, ‘Sinemydidae’ and Panchelonioidea were also very diverse in this period. 相似文献
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Gennady Cherepanov 《Journal of morphology》2019,280(10):1571-1581
The postembryonic development of the turtle carapace was studied in the aquatic Еmys orbicularis and the terrestrial Тestudo graeca. Differences in the structure of the bony shell in aquatic and terrestrial turtles were shown to be associated with varying degrees of development of epidermal derivatives, namely, the thickness of the scutes and the depth of horny furrows. Sinking of the horny furrows into the dermis causes local changes in the structure of the collagen matrix, which might precondition the acceleration of the ossification. Aquatic turtles possess a relatively thin horny cover, whose derivatives are either weakly developed or altogether absent and thus make no noticeable impact on the growth dynamics of bony plates. Carapace plates of these turtles outgrow more or less evenly around the periphery, which results in uniform costals, relatively narrow and partly reduced neurals, and broad peripherals extending beyond the marginal scutes. In terrestrial turtles (Testudinidae), horny structures are much more developed and exert a considerable impact on the growth of bony elements. As a result, bony plates outgrow unevenly in the dermis, expanding fast in the zones under the horny furrows and slowly outside these zones. This determines the basic features of the testudinid carapace: alternately cuneate shape of costals, an alternation of broad octagonal and narrow tetragonal neurals, and the limitation of the growth of peripherals by pleuro-marginal furrows. The evolutionary significance of morphogenetic and constructional differences in the turtle carapace, and the association of these differences with the turtle habitats are discussed. 相似文献